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Co/Ni Ratio Between 0.8 - 5.0 GeV/nucleon from the TIGER-2001 Flight

de Nolfo, G. A. and Barbier, L. M. and Binns, W. R. and Christian, E. R. and Cummings, J. R. and Geier, S. and Israel, M. H. and Link, J. T. and Mewaldt, R. A. and Mitchell, J. W. and Rauch, B. F. and Schindler, S. M. and Scott, L.M. and Stone, E. C. and Streitmatter, R. E. and Waddington, C. J. and Wiedenbeck, M. E. (2007) Co/Ni Ratio Between 0.8 - 5.0 GeV/nucleon from the TIGER-2001 Flight. In: Proceedings of the 30th International Cosmic Ray Conference. Vol.2. Universidad Nacional Autónoma de México , Merida, Yucatan, Mexico, pp. 43-46.

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The Trans-Iron Galactic Element Recorder (TIGER) was launched in December 2001 and 2003 from McMurdo, Antarctica and was designed to observe elements ranging from over an extended energy range. Observations of radioactive isotopes produced during explosive nucleosynthesis such as Ni that decay only through electron capture provide important constraints on the delay between nucleosynthesis and the acceleration of galactic cosmic rays (GCRs). The isotopes of Co and Ni at low energies, in particular, the observations of the Ni and Co from the Cosmic Ray Isotope Spectrometer (CRIS) on the Advanced Composition Explorer, indicate a significant time delay (7.6 10 yr) between GCR nucleosynthesis and acceleration. While TIGER is not able to resolve isotopes, observations of the elemental abundances of Co and Ni at high energies further constrain models for the acceleration and propagation of GCRs. The 2001 2003 flights of TIGER lasted a total of 50 days and collected sufficient statistics to study the Co/Ni elemental ratio over a wide range in energies. We present the elemental ratio of Co/Ni in galactic cosmic rays between 0.8-5.0 GeV/nucleon and compare these results with previous measurements and models for cosmic-ray propagation.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
de Nolfo, G. A.0000-0002-3677-074X
Binns, W. R.0000-0001-6110-3407
Christian, E. R.0000-0003-2134-3937
Geier, S.0000-0002-3948-9339
Israel, M. H.0000-0002-8104-208X
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:Copyright Universidad Nacional Autónoma de México. This research was supported by the National Aeronautics and Space Administration under grant NAGS-5078.
Group:Space Radiation Laboratory
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2008-22
Record Number:CaltechAUTHORS:20150501-112031636
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57152
Deposited By: Deborah Miles
Deposited On:02 Jun 2015 02:07
Last Modified:09 Mar 2020 13:19

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